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Where 21918 is
Approximate ZIP boundary (Census ZCTA 2020). ZIP codes are mail routes, not areas, so the shape shown is the Census tabulation area that approximates it.
- 🔢 Type 21918 into a pocket calculator and turn it upside down: BIGIZ — not quite a word, sorry.
- ➕ As a number, 21,918 = 2 × 3 × 13 × 281. Its digits add up to 21, a total 2,594 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101010110011110 - 🏠 Its numerical neighbours: 21917 (Colora, MD, 4 mi away) and 21919 (Earleville, MD, 22 mi away).
- 🔄 Backwards, 21918 becomes 81912, which is not a ZIP code at all.
- 👥 20 other ZIP codes are made of exactly the same digits (12189, 12198, 12819, 12918, 12981, 18219, …). The farthest-flung twin is 98121 in Seattle, WA, 2,336 miles away.
- 🧭 Farther north than 53% of all ZIP codes, and farther east than 84%.
- 🎯1,187 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21918 and you would come out at 39.68°S, 103.82°E — 859 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 59m of daylight. Shortest: 9h 21m.
- 📏 At 17.6 square miles of land, 21918 is bigger than 35% of ZIP codes — room for about 13 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 4,169This ZIP4,169 |
|---|---|
| Households | 1,775This ZIP1,775 |
| Housing units | 1,815This ZIP1,815 |
| Median age | 42.9This ZIP42.9Maryland39.4US 38.9 |
| Median household income | $84,587This ZIP$84,587Maryland$103,678US $80,734 |
| Median home value | $324,800This ZIP$324,800Maryland$419,900US $332,700 |
| Median gross rent | $876This ZIP$876Maryland$1,705US $1,413 |
| Bachelor's degree or higher | 16.1%This ZIP16.1% |
| Mean commute | 35.6 minThis ZIP35.6 min |
| Population density | 237.3 / sq miThis ZIP237.3 / sq mi |
Business and tax activity
| Business establishments | 48This ZIP48 |
|---|---|
| Employees | 260This ZIP260 |
| Annual payroll | $10,747,000This ZIP$10,747,000 |
| Tax returns filed | 2,010This ZIP2,010 |
| Total adjusted gross income | $151,318,000This ZIP$151,318,000 |
Land area
| Land area | 17.57 sq miThis ZIP17.57 sq mi |
|---|---|
| Water area | 2.55 sq miThis ZIP2.55 sq mi |
ZIP codes near 21918
| ZIP | City | Distance |
|---|---|---|
21034 | Darlington, MD | 3.6 mi |
21917 | Colora, MD | 4.2 mi |
17563 | Peach Bottom, PA | 5.8 mi |
21160 | Whiteford, MD | 7.1 mi |
21904 | Port Deposit, MD | 7.2 mi |
19362 | Nottingham, PA | 7.5 mi |
21911 | Rising Sun, MD | 7.7 mi |
21078 | Havre De Grace, MD | 8.4 mi |
21028 | Churchville, MD | 8.7 mi |
17314 | Delta, PA | 9.4 mi |
Find every ZIP code within 10 miles of 21918 →
Questions about this ZIP code
Where is ZIP code 21918?
21918 is in Conowingo, Maryland, in Cecil County, part of the Philadelphia-Camden-Wilmington, PA-NJ-DE-MD metropolitan area. Its published point location is 39.6782, -76.1759.
What county is 21918 in?
21918 lies in Cecil County.
What area code is 21918?
Conowingo uses area codes 667, 443 and 410, from NANPA's telephone records.
What time zone is 21918 in?
21918 uses America/New_York.
How many people live in 21918?
About 4,169 people live in ZIP code 21918, in 1,775 households, at 237.3 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.
What is the median household income in 21918?
$84,587 a year, against $103,678 across Maryland.
What ZIP codes are near 21918?
The closest are 21034 (3.6 mi), 21917 (4.2 mi), 17563 (5.8 mi), 21160 (7.1 mi) and 21904 (7.2 mi).
Is 21918 a PO Box ZIP code?
21918 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21918 ZIP Code — Conowingo, Maryland (Cecil County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21918
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21918.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.